What is the maximum number of initiating devices permitted in unsupervised means?

The maximum number of initiating devices permitted in unsupervised means is 18. This limit is established to ensure system reliability and maintainability in scenarios where continuous monitoring by personnel is not available. Unsupervised systems typically refer to those areas where fire alarm systems operate without constant human oversight, which necessitates a careful balance between the number of initiating devices and the ability to manage alarms effectively.

By limiting the number of initiating devices to 18, the regulations ensure that the system can be effectively managed, reducing the risk of false alarms and ensuring that any genuine alarm can be promptly addressed. This number allows for sufficient coverage in areas needing protection while ensuring that the integrity and immediacy of alarms can be maintained without overwhelming the system or response capabilities.